Method of making collar-head screws or the like.



APPLICATION FILED OCT. I4, I9I6.

Lamme@ Agua I6? IDIB.

LQ E

' collar 2, and the cylindrical bar 3 intended srarne ROBERT C. PIERCE, OF CINCINNATI, OI-IIO, ASSIGNUR, BY MESN'E ASSIGNMEIYTS, T0

THOMSON ELECTRIC WELDIN RATION QF MASSACHUSETTS.

COMPANY, CF LYNN, MASSACHUSETTS, A. CORPO- METHOD OE MNG COLLAR-HEAD SCREWS 0R THE LIKE.

Specification of Letters Patent.

Application led october 14, i916. Serial No. metta.

To all 'whom it may concern:

Be it known that I, ROBERT C. PIERCE, a citizen of the United States, anda resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented a'certainv new and useful Method of Making Collar- Head Screws or the like; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which' it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which forni a part of this specification.

This invention relates to the manufacture of screws, bolts or the like of the collar head type. v

In the manufacture of articles of this character it has heretofore been the practice, so far as I am aware, to make the articles from stock of a diameter corresponding to the desired diameter of the collar and to then turn the metal down to form the head and particularly the shank of the screw, bolt or rod, as the case may be, thereby causing a great waste of material and labor incident to the removal of such waste-or surplus material from the stock.

rl `he primary object of my invention is the provision of a simple and improved method of making articles of the class described whereby a considerable saving of material, labor and expense in the manufacture lof such articles is effected.

The invention is fully described in the following specification, and while, in its broader aspect, it is capable of being practised in numerous ways, a preferred manner of practising the saine is illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of the several parts of an article embodying the invention in assembled relation and with the collar in section. Fig. 2 is a perspective view of said parts as they appear after being welded together, and Fig. 3 is a side elevation of the finished article before the thread has been cut on the shank thereof. l

In the practising of the linvention three parts are employed, namely, the head l, the

to forni the body or shank portion of the screw, lbolt or the like. The head l, which may be round, square, octagonal, or other suitable shape, is provided at its inner end with an integral axial stud 4:, whicliis circular incross-sectioii and lof less diameter than that of the body part 3. rIlie collar 2 has its opening of suitable size to fit snugly on the stud l and has the yedges of its opening Wall preferably cut away, asiat 5.

When the parts l, 2 and 3 have beenl assembled, as shown inFig. l, with the adjacent ends of the part 3 and head stud 4 in centered end abutment, an electric welding current is passed through the head l and v body 8 to effect a heating and softening of the parte 3 and l at the point of contact. During the softening of the stock the parts 1 and 3 are forced together under a desired compressing stress, as is well understood in the welding art, thus causing an axial cornpressing and transverse spreading of' lthe metal in the stud a to fill the spaces 5 in the collar and to permit the inner end of the body 3 to be forced adjacent 'to the collar thereby edectually welding the parts 3 and l; together and rigidly securing the collar 2 to the head l. The welding together of the body 3 and stud 4 in this manner forms a bur oil-ragged metal part 6 at the outer side -of the collar, and this is lsubsequently removed by a milling or turning down operation or in any other suitable manner, as is well understood in the art^` When the bur 6 has been removed the collar, head and shank have the appearance of a single integral member.

I wish it understood lthat my invention is not limited to the particular details shown and described, as it may be performed in numerous other ways without departing from. the spirit of the claims.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent', iszl. The method of manufacturing collar screws, bolts or the like, consisting in providing a head art having a stud projecting therefrom, .a siank part of greater crosssectional area thansaid stud, and a collar fitted on said stud, and then rigidly uniting said parts and collar by welding an end of the shank part to the outer end of said stud and simultaneously applying an axial compressing stress thereto to upset said stu-d at the edge of the collar, Y,

screws, bolts or the like, consisting in pro Aso fst

vidin a head art having a stud projecting there rom, a s ank part oi greater cross sectional area than said stud, and a collar fitted on said stud and transversely reduced at its inner edge portion, then welding an end of the shank part to the outer end o said stud and applyingan axial compressing stress thereto when heated to upset t e inetai around the inner edge of the collar.

3. rlihe method of manufacturing coliar screws, bolts or the like, consisting in providing a head part having a cylindrical stud yaxially projecting from one end thereof, a cylindrical shank of greater diameter than said stud, and a collar fitted on said stud and havingI the edges of its o enin "wall cut away, then electrically wel ing t e shanh part and stud'together in centered end ahntinent and applying axial pressure thereto when heated to axially shorten and 'transn versely expandsaid stud, the surplus mate rial atthe outer side of the collar then being removed.

e. The method of manufacturing coliar head screws, bolts or the like consisting in providinIl a head part havin. a stud pro jecting t erefrom, a collar tted on said stud and being of less thickness than the length of said stud, and a shank part inl end abutting relation to said stud With'its abutting end portion of greater cross-sectional area than said stud and rigidly uniting said parts and collar by Welding together the abutting ends of said stud and shank part and simultaneously applying an axial compressing stress thereto to npset said stud at the edge of the collar. v

5. rlhe method oi'c' manufacturing collar screws, bolts or the like consisting in proi vidinoa head part having a stiid proj ectnigq thereirom, a collar fitted on said stnd and hein@7 ont tess thickness than the lengthoii said stud, and a shank part in end abutting relation to said stud with its ahntting end portion oi greater crosssectional area thanl said stnd and rigidly nnitingA said parts and coliar by Welding together e abutting ends of said stud and shank part and simultaneously applying an axiai compressing stress thereto to upset said stud at the edge oi: the collar, and removin the our formed at the outer side of the coiiar hy the upsetting op i eration,

6. The method or manufacturing collar screws, hoits or the hire, consisting in providing a head naithaving a stud projiecting thereironfi, a siank part oi greater cross= sectionai area than said stud, and a collar vfitted on said stud, rigidiy nnitingsaid parts and coilar hy inleiding,7 an end ot the shank part to the outer end of said stud and siinnl# esl iitted on said stud and transversely reduced at its innei` edge portion, welding an end ot the shank part to the outer end et said stud and applying an airiai compressing stress thereto when heated. to upset the metal around the inner edge of the collar, and removing the bnr termed Without the diameter coiiar.,

in' testimony Whereoit", have hereunto signed naine to this specification.

se of the 'shanir part at the outer side of said l 

